Method for configuring sidelink resources based on user equipment speed in communication system an apparatus for the same

ABSTRACT

A sidelink communication method performed by a UE is provided. The method includes receiving from a base station a message including zone configuration information and resource pool configuration information and selecting a zone type mapped to a speed of the UE among zone types indicated by the zone configuration information. A zone identifier is determined based on configuration information of the selected zone type, the configuration information of the selected zone type being included in the zone configuration information. The sidelink communication is performed using a resource pool mapped to the zone identifier among resource pools indicated by the resource pool configuration information.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of priorities to U.S. ProvisionalPatent Application No. 62/726,674, filed on Sep. 4, 2018 with the U.S.Patent and Trademark Office, and Korean Patent Application No.10-2019-0099615, filed on Aug. 14, 2019 in the Korean IntellectualProperty Office (KIPO), the entire contents of which are incorporatedherein by reference.

BACKGROUND 1. Technical Field

The present disclosure relates generally to sidelink communicationtechnology, and more specifically, to a technique for configuring aresource pool based on a speed of a user equipment (UE).

2. Related Art

Various systems have been developed for processing wireless data such asthe fourth-generation (4G) communication system (e.g., Long TermEvolution (LTE) communication system or LTE-Advanced (LTE-A)communication system) and the fifth-generation (5G) communication system(e.g., New Radio (NR) communication system), which uses a frequency bandhigher than the frequency band of the 4G communication system. The 5Gcommunication system supports Enhanced Mobile Broadband (eMBB)communications, Ultra-Reliable and Low-Latency communications (URLLC),massive Machine Type Communications (mMTC), and the like.

The 4G communication system and 5G communication system supportVehicle-to-Everything (V2X) communications. The V2X communicationssupported in a cellular communication system, such as the 4Gcommunication system, the 5G communication system, and the like, may bereferred to as “Cellular-V2X (C-V2X) communications.” The V2Xcommunications (e.g., C-V2X communications) may includeVehicle-to-Vehicle (V2V) communications, Vehicle-to-Infrastructure (V2I)communications, Vehicle-to-Pedestrian (V2P) communication,Vehicle-to-Network (V2N) communication, and the like.

In the cellular communication system, the V2X communications (e.g.,C-V2X communications) may be performed based on “sidelink” communicationtechnologies (e.g., Proximity-based Services (ProSe) communicationtechnology, Device-to-Device (D2D) communication technology, or thelike). For example, sidelink channels for vehicles participating in V2Vcommunications may be established, and communications between thevehicles may be performed using the sidelink channels.

Meanwhile, geographical zones may be configured for the sidelinkcommunication, and a resource pool for each of the zones may beconfigured. A user equipment (UE) belonging to a zone may performsidelink communication using a resource pool mapped to the zone.However, when the UE moves at a high speed, the zone to which the UEbelongs may be changed, and thus the resource pool that the UE has touse may also be changed. Accordingly, the efficiency of the sidelinkcommunication may deteriorate.

SUMMARY

Accordingly, exemplary embodiments of the present disclosure provide amethod and an apparatus for configuring a resource pool based on a speedof user equipment (UE).

According to the exemplary embodiments of the present disclosure, asidelink communication method performed by a UE may include receivingfrom a base station a message including zone configuration informationand resource pool configuration information; selecting a zone typemapped to a speed of the UE among a plurality of zone types indicated bythe zone configuration information; determining a zone identifier basedon configuration information of the selected zone type, theconfiguration information of the selected zone type being included inthe zone configuration information; and performing sidelinkcommunication using a resource pool mapped to the zone identifier amongresource pool(s) indicated by the resource pool configurationinformation.

The plurality of zone types may be classified into a high-zone and alow-zone. The high-zone and the low-zone may have different sizes, andthe high-zone may be selected among the plurality of zone types when thespeed of the UE is equal to or greater than a speed threshold, and thelow-zone may be selected among the plurality of zone types when thespeed of the UE is less than the speed threshold. The zone configurationinformation may include the speed threshold. The resource poolconfiguration information may include configuration information ofresource pool(s) for the high-zone and configuration information ofresource pool(s) for the low-zone.

In addition, the plurality of zone types may be classified into ahigh-zone, a medium-zone, and a low-zone. The high-zone, themedium-zone, and the low-zone may have different sizes, and thehigh-zone may be selected among the plurality of zone types when thespeed of the UE is equal to or greater than a first speed threshold, themedium-zone may be selected among the plurality of zone types when thespeed of the UE is less than the first speed threshold and equal to orgreater than a second speed threshold, the low-zone may be selectedamong the plurality of zone types when the speed of the UE is less thanthe second speed threshold. The first speed threshold may be greaterthan the second speed threshold.

The message may be a system information block (SIB). The sidelinkcommunication method may further include, before receiving the message,transmitting to the base station information regarding a position of theUE and the speed of the UE. The sidelink communication method may alsoinclude transmitting to the base station information indicating theselected zone type.

Furthermore, according to the exemplary embodiments of the presentdisclosure, an operation method of a base station supporting sidelinkcommunication may include generating zone configuration informationincluding configuration information of a plurality of zone types;generating resource pool configuration information includingconfiguration information of resource pools for the plurality of zonetypes; and transmitting a message including the zone configurationinformation and the resource pool configuration information to a userequipment (UE), wherein sizes of zones having different zone types aredifferent.

The plurality of zone types may be classified into a high-zone and alow-zone. The high-zone and the low-zone may have different sizes, andthe high-zone may be selected among the plurality of zone types when thespeed of the UE is equal to or greater than a speed threshold, and thelow-zone may be selected among the plurality of zone types when thespeed of the UE is less than the speed threshold. The zone configurationinformation may include the speed threshold. The resource poolconfiguration information may include configuration information ofresource pool(s) for the high-zone and configuration information ofresource pool(s) for the low-zone.

In addition, the plurality of zone types may be classified into ahigh-zone, a medium-zone, and a low-zone. The high-zone, themedium-zone, and the low-zone may have different sizes, the high-zonemay be selected among the plurality of zone types when the speed of theUE is equal to or greater than a first speed threshold, the medium-zonemay be selected among the plurality of zone types when the speed of theUE is less than the first speed threshold and equal to or greater than asecond speed threshold, the low-zone may be selected among the pluralityof zone types when the speed of the UE is less than the second speedthreshold, and the first speed threshold may be greater than the secondspeed threshold. The operation method may further include receiving fromthe UE information indicating the zone type selected by the UE among theplurality of zone types.

Furthermore, according to the exemplary embodiments of the presentdisclosure, a sidelink communication method performed by a UE mayinclude transmitting a first message to a base station, the firstmessage including information regarding a position and a speed of theUE; receiving a second message from the base station, the second messageincluding zone configuration information including configurationinformation of a zone type selected based on the speed of the UE among aplurality of zone types and resource pool configuration informationincluding configuration information of resource pool(s) for the selectedzone type;

determining a zone identifier based on the zone configurationinformation; and performing sidelink communication using a resource poolmapped to the zone identifier among resource pool(s) indicated by theresource pool configuration information.

The plurality of zone types may be classified into a high-zone and alow-zone. The high-zone and the low-zone may have different sizes, thehigh-zone may be selected among the plurality of zone types when thespeed of the UE is equal to or greater than a speed threshold, and thelow-zone may be selected among the plurality of zone types when thespeed of the UE is less than the speed threshold.

In addition, the plurality of zone types may be classified into ahigh-zone, a medium-zone, and a low-zone. The high-zone, themedium-zone, and the low-zone may have different sizes, the high-zonemay be selected among the plurality of zone types when the speed of theUE is equal to or greater than a first speed threshold, the medium-zonemay be selected among the plurality of zone types when the speed of theUE is less than the first speed threshold and equal to or greater than asecond speed threshold, the low-zone may be selected among the pluralityof zone types when the speed of the UE is less than the second speedthreshold, and the first speed threshold may be greater than the secondspeed threshold.

The second message may be a radio resource control (RRC) connectionreconfiguration message.

Furthermore, according to the exemplary embodiments of the presentdisclosure, an operation method of a base station supporting sidelinkcommunication may include receiving a first message from a userequipment (UE), the first message including information regarding aposition and a speed of the UE; selecting a zone type mapped to thespeed of the UE among a plurality of zone types; configuring resourcepool(s) for the selected zone type; and transmitting to the UE a secondmessage including zone configuration information including configurationinformation of the selected zone type and resource pool configurationinformation including configuration information of the resource pool(s),wherein sizes of zones having different zone types are different.

The plurality of zone types may be classified into a high-zone and alow-zone. The high-zone and the low-zone have different sizes, thehigh-zone may be selected among the plurality of zone types when thespeed of the UE is equal to or greater than a speed threshold, and thelow-zone may be selected among the plurality of zone types when thespeed of the UE is less than the speed threshold.

In addition, the plurality of zone types may be classified into ahigh-zone, a medium-zone, and a low-zone. The high-zone, themedium-zone, and the low-zone may have different sizes, the high-zonemay be selected among the plurality of zone types when the speed of theUE is equal to or greater than a first speed threshold, the medium-zonemay be selected among the plurality of zone types when the speed of theUE is less than the first speed threshold and equal to or greater than asecond speed threshold, the low-zone may be selected among the pluralityof zone types when the speed of the UE is less than the second speedthreshold, and the first speed threshold may be greater than the secondspeed threshold.

Additionally, according to the exemplary embodiments of the presentdisclosure, a UE performing sidelink communication in a communicationsystem may include a processor, a transceiver operated by the processor,and a memory configured to store at least one instruction executable bythe processor. When executed by the processor, the at least oneinstruction may be configured to receive from a base station a messageincluding zone configuration information and resource pool configurationinformation; select a zone type mapped to a speed of the UE among aplurality of zone types indicated by the zone configuration information;determine a zone identifier based on configuration information of theselected zone type, the configuration information of the selected zonetype being included in the zone configuration information; and perform asidelink communication using a resource pool mapped to the zoneidentifier among resource pool(s) indicated by the resource poolconfiguration information.

The plurality of zone types may be classified into a high-zone and alow-zone. The high-zone and the low-zone may have different sizes, thehigh-zone may be selected among the plurality of zone types when thespeed of the UE is equal to or greater than a speed threshold, and thelow-zone may be selected among the plurality of zone types when thespeed of the UE is less than the speed threshold. The resource poolconfiguration information may include configuration information ofresource pool(s) for the high-zone and configuration information ofresource pool(s) for the low-zone. The at least one instruction may befurther configured to transmit information indicating the selected zonetype to the base station.

Furthermore, according to the exemplary embodiments of the presentdisclosure, a base station supporting sidelink communication in acommunication system may include a processor, a transceiver operated bythe processor, and a memory configured to store at least one instructionexecutable by the processor. When executed by the processor, the atleast one instruction may be configured to generate zone configurationinformation including configuration information of a plurality of zonetypes; generate resource pool configuration information includingconfiguration information of resource pools for the plurality of zonetypes; and transmit a message including the zone configurationinformation and the resource pool configuration information to a userequipment (UE), wherein sizes of zones having different zone types aredifferent.

Additionally, according to the exemplary embodiments of the presentdisclosure, a UE performing sidelink communication in a communicationsystem may include a processor, a transceiver operated by the processor,and a memory configured to store at least one instruction executable bythe processor. Additionally, when executed by the processor, the atleast one instruction may be configured to transmit a first message to abase station, the first message including information regarding aposition and a speed of the UE; receive a second message from the basestation, the second message including zone configuration informationincluding configuration information of a zone type selected based on thespeed of the UE among a plurality of zone types and resource poolconfiguration information including configuration information ofresource pool(s) for the selected zone type; determine a zone identifierbased on the zone configuration information; and perform sidelinkcommunication using a resource pool mapped to the zone identifier amongresource pool(s) indicated by the resource pool configurationinformation.

The plurality of zone types may be classified into a high-zone and alow-zone. The high-zone and the low-zone may have different sizes, thehigh-zone may be selected among the plurality of zone types when thespeed of the UE is equal to or greater than a speed threshold, and thelow-zone may be selected among the plurality of zone types when thespeed of the UE is less than the speed threshold. The second message maybe a radio resource control (RRC) connection reconfiguration message.

Furthermore, according to the exemplary embodiments of the presentdisclosure, a base station supporting sidelink communication in acommunication system may include a processor, a transceiver operated bythe processor, and a memory configured to store at least one instructionexecutable by the processor. Additionally, when executed by theprocessor, the at least one instruction may be configured to receive afirst message from a user equipment (UE), the first message includinginformation regarding a position and a speed of the UE; select a zonetype that is mapped to the speed of the UE among a plurality of zonetypes; configure resource pool(s) for the selected zone type; andtransmit to the UE a second message including zone configurationinformation including configuration information of the selected zonetype and resource pool configuration information including configurationinformation of the resource pool(s), wherein sizes of zones havingdifferent zone types are different.

In accordance with the exemplary embodiments of the present disclosure,the base station may include a plurality of zone types (e.g., high-zone,medium-zone, and low-zone), and may be configured to transmitconfiguration information of the zone types to the UE. The sizes of thehigh-zone, medium-zone, and low-zone may be different. The UE may beconfigured to receive the configuration information of the zone typesfrom the base station, determined a zone type based on the current speedof the UE, determine a zone identifier based on the determined zonetype, and perform sidelink communication using a resource pool mapped tothe zone identifier.

Alternatively, the base station may be configured to select one zonetype that corresponds to the speed of the UE among the plurality of zonetypes, and transmit configuration information of the selected zone typeto the UE. The UE may also be configured to receive the configurationinformation from the base station, determine a zone identifier based onthe configuration information, and perform sidelink communication usinga resource pool mapped to the zone identifier.

Since the size of the zone, which is used by the UE, varies based on thespeed of the UE, the UE moving at a high speed may perform sidelinkcommunication using the resource pool mapped to the corresponding zone(e.g., a zone having a relatively large size). Therefore, the sidelinkcommunication may be performed more efficiently, and thus theperformance of the communication system may be improved.

BRIEF DESCRIPTION OF DRAWINGS

Exemplary embodiments of the present disclosure will become moreapparent by describing in detail exemplary embodiments of the presentdisclosure with reference to the accompanying drawings, in which:

FIG. 1 is a conceptual diagram illustrating V2X communication scenariosaccording to an exemplary embodiment of the present disclosure;

FIG. 2 is a conceptual diagram illustrating a cellular communicationsystem according to an exemplary embodiment of the present disclosure;

FIG. 3 is a conceptual diagram illustrating a communication nodeconstituting a cellular communication system according to an exemplaryembodiment of the present disclosure;

FIG. 4 is a block diagram illustrating a user plane protocol stack of anUE performing sidelink communication according to an exemplaryembodiment of the present disclosure;

FIG. 5 is a block diagram illustrating a control plane protocol stack ofan UE performing sidelink communication according to an exemplaryembodiment of the present disclosure;

FIG. 6 is a block diagram illustrating a control plane protocol stack ofan UE performing sidelink communication according to an exemplaryembodiment of the present disclosure;

FIG. 7 is a sequence chart illustrating a first exemplary embodiment ofa sidelink communication method in a communication system; and

FIG. 8 is a sequence chart illustrating a second exemplary embodiment ofa sidelink communication method in a communication system.

It should be understood that the above-referenced drawings are notnecessarily to scale, presenting a somewhat simplified representation ofvarious features illustrative of the basic principles of the disclosure.The specific design features of the present disclosure, including, forexample, specific dimensions, orientations, locations, and shapes, willbe determined in part by the particular intended application and useenvironment.

DETAILED DESCRIPTION

Exemplary embodiments of the present disclosure are disclosed herein.However, specific structural and functional details disclosed herein aremerely representative for purposes of describing exemplary embodimentsof the present disclosure. Thus, exemplary embodiments of the presentdisclosure may be embodied in many alternate forms and should not beconstrued as limited to exemplary embodiments of the present disclosureset forth herein.

Accordingly, while the present disclosure is capable of variousmodifications and alternative forms, specific exemplary embodimentsthereof are shown by way of example in the drawings and will herein bedescribed in detail. It should be understood, however, that there is nointent to limit the present disclosure to the particular formsdisclosed, but on the contrary, the present disclosure is to cover allmodifications, equivalents, and alternatives falling within the spiritand scope of the present disclosure. Like numbers refer to like elementsthroughout the description of the figures.

It will be understood that, although the terms first, second, etc. maybe used herein to describe various elements, these elements should notbe limited by these terms. These terms are only used to distinguish oneelement from another. For example, a first element could be termed asecond element, and, similarly, a second element could be termed a firstelement, without departing from the scope of the present disclosure. Asused herein, the term “and/or” includes any and all combinations of oneor more of the associated listed items.

It will be understood that when an element is referred to as being“connected” or “coupled” to another element, it may be directlyconnected or coupled to the other element or intervening elements may bepresent. In contrast, when an element is referred to as being “directlyconnected” or “directly coupled” to another element, there are nointervening elements present. Other words used to describe therelationship between elements should be interpreted in a like fashion(i.e., “between” versus “directly between,” “adjacent” versus “directlyadjacent,” etc.).

The terminology used herein is for the purpose of describing particularembodiments only and is not intended to be limiting of the presentdisclosure. As used herein, the singular forms “a,” “an” and “the” areintended to include the plural forms as well, unless the context clearlyindicates otherwise. It will be further understood that the terms“comprises,” “comprising,” “includes” and/or “including,” when usedherein, specify the presence of stated features, integers, steps,operations, elements, and/or components, but do not preclude thepresence or addition of one or more other features, integers, steps,operations, elements, components, and/or groups thereof.

Unless otherwise defined, all terms (including technical and scientificterms) used herein have the same meaning as commonly understood by oneof ordinary skill in the art to which this present disclosure belongs.It will be further understood that terms, such as those defined incommonly used dictionaries, should be interpreted as having a meaningthat is consistent with their meaning in the context of the relevant artand will not be interpreted in an idealized or overly formal senseunless expressly so defined herein.

It is understood that the term “vehicle” or “vehicular” or other similarterm as used herein is inclusive of motor vehicles in general such aspassenger automobiles including sports utility vehicles (SUV), buses,trucks, various commercial vehicles, watercraft including a variety ofboats and ships, aircraft, and the like, and includes hybrid vehicles,electric vehicles, plug-in hybrid electric vehicles, hydrogen-poweredvehicles and other alternative fuel vehicles (e.g., fuels derived fromresources other than petroleum). As referred to herein, a hybrid vehicleis a vehicle that has two or more sources of power, for example bothgasoline-powered and electric-powered vehicles.

Additionally, it is understood that one or more of the below methods, oraspects thereof, may be executed by at least one control unit. The term“control unit” or “controller” may refer to a hardware device thatincludes a memory and a processor. The memory is configured to storeprogram instructions, and the processor is specifically programmed toexecute the program instructions to perform one or more processes whichare described further below. The control unit may control operation ofunits, modules, parts, or the like, as described herein. Moreover, it isunderstood that the below methods may be executed by an apparatus (e.g.,communication node) comprising the control unit in conjunction with oneor more other components, as would be appreciated by a person ofordinary skill in the art.

Furthermore, the control unit of the present disclosure may be embodiedas non-transitory computer readable media containing executable programinstructions executed by a processor, controller or the like. Examplesof the computer readable mediums include, but are not limited to, ROM,RAM, compact disc (CD)-ROMs, magnetic tapes, floppy disks, flash drives,smart cards and optical data storage devices. The computer readablerecording medium can also be distributed throughout a computer networkso that the program instructions are stored and executed in adistributed fashion, e.g., by a telematics server or a Controller AreaNetwork (CAN).

Hereinafter, exemplary embodiments of the present disclosure will bedescribed in greater detail with reference to the accompanying drawings.To facilitate general understanding in describing the presentdisclosure, the same components in the drawings are denoted with thesame reference signs, and repeated description thereof will be omitted.

FIG. 1 is a conceptual diagram illustrating V2X communication scenarios.As shown in FIG. 1 , the V2X communications may includeVehicle-to-Vehicle (V2V) communications, Vehicle-to-Infrastructure (V2I)communications, Vehicle-to-Pedestrian (V2P) communications,Vehicle-to-Network (V2N) communications, and the like. The V2Xcommunications may be supported by a cellular communication system(e.g., a cellular communication system 140), and the V2X communicationssupported by the cellular communication system 140 may be referred to as“Cellular-V2X (C-V2X) communications.” Particularly, the cellularcommunication system 140 may include the 4G communication system (e.g.,LTE communication system or LTE-A communication system), the 5Gcommunication system (e.g., NR communication system), and the like.

The V2V communications may include communications between a firstvehicle 100 (e.g., a communication node located within the vehicle 100(e.g., the first vehicle)) and a second vehicle 110 (e.g., acommunication node located within the vehicle 110 (e.g., the secondvehicle)). Various driving information such as velocity, heading, time,position, and the like may be exchanged between the vehicles 100 and 110via the V2V communications. For example, autonomous driving (e.g.,platooning) may be supported based on the driving information exchangedvia the V2V communications. The V2V communications supported in thecellular communication system 140 may be performed based on “sidelink”communication technologies (e.g., ProSe and D2D communicationtechnologies, and the like). In particular, the communications betweenthe vehicles 100 and 110 may be performed using at least one sidelinkchannel established between the vehicles 100 and 110.

The V2I communications may include communications between the firstvehicle 100 (e.g., the communication node located in the vehicle 100)and an infrastructure (e.g., road side unit (RSU)) 120 located on aroadside. The infrastructure 120 may also include a traffic light or astreet light located on the roadside. For example, when the V2Icommunications are performed, the communications may be performedbetween the communication node located in the first vehicle 100 and acommunication node located in a traffic light. Traffic information,driving information, and the like may be exchanged between the firstvehicle 100 and the infrastructure 120 via the V2I communications. TheV2I communications supported in the cellular communication system 140may also be performed based on sidelink communication technologies(e.g., ProSe and D2D communication technologies, and the like). Inparticular, the communications between the vehicle 100 and theinfrastructure 120 may be performed using at least one sidelink channelestablished between the vehicle 100 and the infrastructure 120.

The V2P communications may include communications between the firstvehicle 100 (e.g., the communication node located within the vehicle100) and a person 130 (e.g., a communication node carried by the person130). The driving information of the first vehicle 100 and movementinformation of the person 130 such as velocity, heading, time, position,and the like may be exchanged between the vehicle 100 and the person 130via the V2P communications. The communication node mounted within thevehicle 100 or the communication node carried by the person 130 may beconfigured to generate an alarm that indicates a danger by detecting adangerous situation based on the obtained driving information andmovement information. The V2P communications supported in the cellularcommunication system 140 may be performed based on sidelinkcommunication technologies (e.g., ProSe and D2D communicationtechnologies, and the like). In particular, the communications betweenthe communication node mounted within the vehicle 100 and thecommunication node carried by the person 130 may be performed using atleast one sidelink channel established between the communication nodes.

The V2N communications may be communications between the first vehicle100 (e.g., the communication node located in the vehicle 100) and aserver connected via the cellular communication system 140. The V2Ncommunications may be performed based on the 4G communication technology(e.g., LTE or LTE-A) or the 5G communication technology (e.g., NR). Inaddition, the V2N communications may be performed based on a WirelessAccess in Vehicular Environments (WAVE) communication technology or aWireless Local Area Network (WLAN) communication technology which isdefined in Institute of Electrical and Electronics Engineers (IEEE)802.11, or a Wireless Personal Area Network (WPAN) communicationtechnology defined in IEEE 802.15.

Moreover, the cellular communication system 140 that supports the V2Xcommunications may be configured as follows. FIG. 2 is a conceptualdiagram illustrating exemplary embodiments of a cellular communicationsystem. As shown in FIG. 2 , a cellular communication system may includean access network, a core network, and the like. The access network mayinclude a base station 210, a relay 220, User Equipment (UEs) 231through 236, and the like. The UEs 231 through 236 may includecommunication nodes mounted within the vehicles 100 and 110 of FIG. 1 ,the communication node mounted within the infrastructure 120 of FIG. 1 ,the communication node carried by the person 130 of FIG. 1 , and thelike. When the cellular communication system supports the 4Gcommunication technology, the core network may include a serving gateway(S-GW) 250, a packet data network (PDN) gateway (P-GW) 260, a mobilitymanagement entity (MME) 270, and the like.

When the cellular communication system supports the 5G communicationtechnology, the core network may include a user plane function (UPF)250, a session management function (SMF) 260, an access and mobilitymanagement function (AMF) 270, and the like. Alternatively, when thecellular communication system operates in a Non-Stand Alone (NSA) mode,the core network constituted by the S-GW 250, the P-GW 260, and the MME270 may support the 5G communication technology as well as the 4Gcommunication technology, or the core network constituted by the UPF250, the SMF 260, and the AMF 270 may support the 4G communicationtechnology as well as the 5G communication technology.

Additionally, when the cellular communication system supports a networkslicing technique, the core network may be divided into a plurality oflogical network slices. For example, a network slice supporting V2Xcommunications (e.g., a V2V network slice, a V2I network slice, a V2Pnetwork slice, a V2N network slice, etc.) may be configured, and the V2Xcommunications may be supported through the V2X network slice configuredin the core network.

The communication nodes (e.g., base station, relay, UE, S-GW, P-GW, MME,UPF, SMF, AMF, etc.) including the cellular communication system may beconfigured to perform communications using at least one communicationtechnology among a code division multiple access (CDMA) technology, atime division multiple access (TDMA) technology, a frequency divisionmultiple access (FDMA) technology, an orthogonal frequency divisionmultiplexing (OFDM) technology, a filtered OFDM technology, anorthogonal frequency division multiple access (OFDMA) technology, asingle carrier FDMA (SC-FDMA) technology, a non-orthogonal multipleaccess (NOMA) technology, a generalized frequency division multiplexing(GFDM) technology, a filter bank multi-carrier (FBMC) technology, auniversal filtered multi-carrier (UFMC) technology, and a space divisionmultiple access (SDMA) technology.

The communication nodes (e.g., base station, relay, UE, S-GW, P-GW, MME,UPF, SMF, AMF, etc.) including the cellular communication system may beconfigured as follows. FIG. 3 is a conceptual diagram illustratingexemplary embodiments of a communication node constituting a cellularcommunication system. As shown in FIG. 3 , a communication node 300 mayinclude at least one processor 310, a memory 320, and a transceiver 330connected to a network for performing communications. Additionally, thecommunication node 300 may further include an input interface device340, an output interface device 350, a storage device 360, and the like.Each component included in the communication node 300 may be configuredto communicate with each other as connected via a bus 370.

However, each of the components included in the communication node 300may be connected to the processor 310 via a separate interface or aseparate bus rather than the common bus 370. For example, the processor310 may be connected to at least one of the memory 320, the transceiver330, the input interface device 340, the output interface device 350,and the storage device 360 via a dedicated interface.

The processor 310 may be configured to execute at least one instructionstored in at least one of the memory 320 and the storage device 360. Theprocessor 310 may refer to a central processing unit (CPU), a graphicsprocessing unit (GPU), or a dedicated processor on which methods inaccordance with exemplary embodiments of the present disclosure areperformed. Each of the memory 320 and the storage device 360 may includeat least one of a volatile storage medium and a non-volatile storagemedium. For example, the memory 320 may include at least one ofread-only memory (ROM) and random access memory (RAM).

Referring again to FIG. 2 , in the communication system, the basestation 210 may form a macro cell or a small cell, and may be connectedto the core network via an ideal backhaul or a non-ideal backhaul. Thebase station 210 may be configured to transmit signals received from thecore network to the UEs 231 through 236 and the relay 220, and transmitsignals received from the UEs 231 through 236 and the relay 220 to thecore network. The UEs 231, 232, 234, 235 and 236 may be part of cellcoverage of the base station 210. The UEs 231, 232, 234, 235 and 236 maybe connected to the base station 210 by performing a connectionestablishment procedure with the base station 210. The UEs 231, 232,234, 235 and 236 may be configured to communicate with the base station210 after being connected to the base station 210.

The relay 220 may be connected to the base station 210 and may beconfigured to relay communications between the base station 210 and theUEs 233 and 234. In other words, the relay 220 may be configured totransmit signals received from the base station 210 to the UEs 233 and234, and transmit signals received from the UEs 233 and 234 to the basestation 210. The UE 234 may belong to both of the cell coverage of thebase station 210 and the cell coverage of the relay 220, and the UE 233may belong to the cell coverage of the relay 220. In other words, the UE233 may be disposed outside the cell coverage of the base station 210.The UEs 233 and 234 may be connected to the relay 220 by performing aconnection establishment procedure with the relay 220. The UEs 233 and234 may be configured to communicate with the relay 220 after beingconnected to the relay 220.

The base station 210 and the relay 220 may support multiple-input,multiple-output (MIMO) technologies (e.g., single user (SU)-MIMO,multi-user (MU)-MIMO, massive MIMO, etc.), coordinated multipoint (CoMP)communication technologies, carrier aggregation (CA) communicationtechnologies, unlicensed band communication technologies (e.g., LicensedAssisted Access (LAA), enhanced LAA (eLAA), etc.), sidelinkcommunication technologies (e.g., ProSe communication technology, D2Dcommunication technology), or the like. The UEs 231, 232, 235 and 236may be configured to perform operations that correspond to the basestation 210 and operations supported by the base station 210. The UEs233 and 234 may be configured to perform operations that correspond tothe relays 220 and operations supported by the relays 220.

Particularly, the base station 210 may be referred to as a Node B (NB),an evolved Node B (eNB), a base transceiver station (BTS), a radioremote head (RRH), a transmission reception point (TRP), a radio unit(RU), a roadside unit (RSU), a radio transceiver, an access point, anaccess node, or the like. The relay 220 may be referred to as a smallbase station, a relay node, or the like. Each of the UEs 231 through 236may be referred to as a terminal, an access terminal, a mobile terminal,a station, a subscriber station, a mobile station, a portable subscriberstation a subscriber station, a node, a device, an on-broad unit (OBU),or the like.

Meanwhile, the communications between the UEs 235 and 236 may beperformed based on the sidelink communication technique. The sidelinkcommunications may be performed based on a one-to-one scheme or aone-to-many scheme. When V2V communications are performed using thesidelink communication technique, the UE 235 may be the communicationnode mounted within the first vehicle 100 of FIG. 1 and the UE 236 maybe the communication node mounted within the second vehicle 110 of FIG.1 . When V2I communications are performed using the sidelinkcommunication technique, the UE 235 may be the communication nodemounted within first vehicle 100 of FIG. 1 and the UE 236 may be thecommunication node mounted within the infrastructure 120 of FIG. 1 .When V2P communications are performed using the sidelink communicationtechnique, the UE 235 may be the communication node mounted within firstvehicle 100 of FIG. 1 and the UE 236 may be the communication nodecarried by the person 130 of FIG. 1 .

The scenarios to which the sidelink communications are applied may beclassified as shown below in Table 1 based on the positions of the UEs(e.g., the UEs 235 and 236) participating in the sidelinkcommunications. For example, the scenario for the sidelinkcommunications between the UEs 235 and 236 shown in FIG. 2 may be asidelink communication scenario C.

TABLE 1 Sidelink Communication Scenario Position of UE 235 Position ofUE 236 A Out of coverage of Out of coverage of base station 210 basestation 210 B In coverage of Out of coverage of base station 210 basestation 210 C In coverage of In coverage of base station 210 basestation 210 D In coverage of In coverage of base station 210 other basestation

Meanwhile, a user plane protocol stack of the UEs (e.g., the UEs 235 and236) performing sidelink communications may be configured as follows.FIG. 4 is a block diagram illustrating exemplary embodiments of a userplane protocol stack of an UE performing sidelink communication. Asshown in FIG. 4 , a left UE may be the UE 235 shown in FIG. 2 and aright UE may be the UE 236 shown in FIG. 2 . The scenario for thesidelink communications between the UEs 235 and 236 may be one of thesidelink communication scenarios A through D of Table 1. The user planeprotocol stack of each of the UEs 235 and 236 may include a physical(PHY) layer, a medium access control (MAC) layer, a radio link control(RLC) layer, and a packet data convergence protocol (PDCP) layer.

The sidelink communications between the UEs 235 and 236 may be performedusing a PC5 interface (e.g., PC5-U interface). A layer-2 identifier (ID)(e.g., a source layer-2 ID, a destination layer-2 ID) may be used forthe sidelink communications and the layer 2-ID may be an identification(ID) configured for the V2X communications (e.g., V2X service).Additionally, in the sidelink communications, a hybrid automatic repeatrequest (HARQ) feedback operation may be supported, and an RLCacknowledged mode (RLC AM) or an RLC unacknowledged mode (RLC UM) may besupported.

Moreover, a control plane protocol stack of the UEs (e.g., the UEs 235and 236) performing sidelink communications may be configured asfollows. FIG. 5 is a block diagram illustrating a first exemplaryembodiment of a control plane protocol stack of an UE performingsidelink communication, and FIG. 6 is a block diagram illustrating asecond exemplary embodiment of a control plane protocol stack of an UEperforming sidelink communication. As shown in FIGS. 5 and 6 , a left UEmay be the UE 235 shown in FIG. 2 and a right UE may be the UE 236 shownin FIG. 2 . The scenario for the sidelink communications between the UEs235 and 236 may be one of the sidelink communication scenarios A throughD of Table 1. The control plane protocol stack illustrated in FIG. 5 maybe a control plane protocol stack for transmission and reception ofbroadcast information (e.g., Physical Sidelink Broadcast Channel(PSBCH)).

The control plane protocol stack shown in FIG. 5 may include a PHYlayer, a MAC layer, an RLC layer, and a radio resource control (RRC)layer. The sidelink communications between the UEs 235 and 236 may beperformed using a PC5 interface (e.g., PC5-C interface). The controlplane protocol stack shown in FIG. 6 may be a control plane protocolstack for one-to-one sidelink communication. The control plane protocolstack shown in FIG. 6 may include a PHY layer, a MAC layer, an RLClayer, a PDCP layer, and a PC5 signaling protocol layer.

Further, channels used in the sidelink communications between the UEs235 and 236 may include a Physical Sidelink Shared Channel (PSSCH), aPhysical Sidelink Control Channel (PSCCH), a Physical Sidelink DiscoveryChannel (PSDCH), and a Physical Sidelink Broadcast Channel (PSBCH). ThePSSCH may be used for transmitting and receiving sidelink data and maybe configured in the UE (e.g., UE 235 or 236) by a higher layersignaling. The PSCCH may be used for transmitting and receiving sidelinkcontrol information (SCI) and may also be configured in the UE (e.g., UE235 or 236) by a higher layer signaling.

The PSDCH may be used for a discovery procedure. For example, adiscovery signal may be transmitted over the PSDCH. The PSBCH may beused for transmitting and receiving broadcast information (e.g., systeminformation). In addition, a demodulation reference signal (DM-RS), asynchronization signal, or the like may be used in the sidelinkcommunications between the UEs 235 and 236. A sidelink transmission mode(TM) may be classified into sidelink TMs 1 to 4 as shown below in Table2.

TABLE 2 Sidelink TM Description 1 Transmission using resources scheduledby base station 2 UE autonomous transmission without scheduling of basestation 3 Transmission using resources scheduled by base station in V2Xcommunications 4 UE autonomous transmission without scheduling of basestation in V2X communications

When the sidelink TM 3 or 4 is supported, each of the UEs 235 and 236may be configured to perform sidelink communications using a resourcepool configured by the base station 210. The resource pool may beconfigured for each of the sidelink control information and the sidelinkdata.

The resource pool for the sidelink control information may be configuredbased on an RRC signaling procedure (e.g., a dedicated RRC signalingprocedure, a broadcast RRC signaling procedure, etc.). The resource poolused for reception of the sidelink control information may be configuredby a broadcast RRC signaling procedure. When the sidelink TM 3 issupported, the resource pool used for transmission of the sidelinkcontrol information may be configured by a dedicated RRC signalingprocedure. Particularly, the sidelink control information may betransmitted via resources scheduled by the base station 210 within theresource pool configured by the dedicated RRC signaling procedure. Whenthe sidelink TM 4 is supported, the resource pool used for transmissionof the sidelink control information may be configured by a dedicated RRCsignaling procedure or a broadcast RRC signaling procedure. Inparticular, the sidelink control information may be transmitted viaresources selected autonomously by the UE (e.g., UE 235 or 236) withinthe resource pool configured by the dedicated RRC signaling procedure orthe broadcast RRC signaling procedure.

When the sidelink TM 3 is supported, the resource pool for transmittingand receiving sidelink data may not be configured. In particular, thesidelink data may be transmitted and received via resources scheduled bythe base station 210. When the sidelink TM 4 is supported, the resourcepool for transmitting and receiving sidelink data may be configured by adedicated RRC signaling procedure or a broadcast RRC signalingprocedure. Particularly, the sidelink data may be transmitted andreceived via resources selected autonomously by the UE (e.g., UE 235 or236) within the resource pool configured by the dedicated RRC signalingprocedure or the broadcast RRC signaling procedure.

Hereinafter, methods for configuring sidelink resources will bedescribed. Even when a method (e.g., transmission or reception of asignal) to be performed at a first communication node amongcommunication nodes is described, a corresponding second communicationnode may be configured to perform a method (e.g., reception ortransmission of the signal) that corresponds to the method performed atthe first communication node. In other words, when an operation of a UE#1 (e.g., first vehicle) is described, a corresponding UE #2 (e.g.,second vehicle) may be configured to perform an operation thatcorresponds to the operation of the UE #1. Conversely, when an operationof the UE #2 (e.g., second vehicle) is described, the corresponding UE#1 (e.g., first vehicle) may be configured to perform an operation thatcorresponds to the operation of the UE #2. In the exemplary embodimentsdescribed below, the operation of the vehicle may be the operation ofthe communication node mounted within the vehicle.

The geographical zones for sidelink communication may be configured anda resource pool for each of the zones may be configured. The zone typesmay be classified based on the speed of the UE speed, and may beclassified in two schemes. For example, the zone types may be classifiedinto a high-zone, a medium-zone, and a low-zone. The high-zone may alsobe referred to as a ‘first zone’, the medium-zone may also be referredto as a ‘second zone’, and the low-zone may also be referred to as a‘third zone’.

In a scheme #1, the base station may configure zone types (e.g.,‘high-zone and low-zone’ or ‘high-zone, medium-zone, and low-zone’), andmay be configured to transmit configuration information of the zonetypes (referred to as ‘zone configuration information’) to the UE. TheUE may then be configured to select one zone type among the zone typesconfigured by the base station based on a current speed. In a scheme #2,the base station may configure one zone type based on the current speedof the UE, and may be configured to transmit configuration informationof the one zone type to the UE. The UE may use the one zone typeconfigured by the base station.

Sidelink Communication Method Based on the Scheme #1

FIG. 7 is a sequence chart illustrating a first exemplary embodiment ofa sidelink communication method in a communication system. As shown inFIG. 7 , a communication system may include a base station and a UE. Thebase station may be a base station belonging to the cellularcommunication system 140 shown in FIG. 1 , and the UE may be a UEmounted within the vehicle 100 shown in FIG. 1 . For example, the basestation may be the base station 210 shown in FIG. 2 , and the UE may beone of the UEs 231 to 236 shown in FIG. 2 . Each of the base station andthe UE may be configured to be the same as or similar to thecommunication node 300 shown in FIG. 3 . The UE may support the protocolstacks shown in FIGS. 4 to 6 .

A UE (e.g., UE operating in a RRC connected state) may be configured toperiodically transmit a first message to the base station, whichincludes at least one of information regarding a position, a speed, andan acceleration of the UE (S700). The position may indicate a longitudeand a latitude of a current position of the UE. For example, theposition may be a geographical coordinate of the current position of theUE. The speed may indicate a current speed of the UE, and may include ahorizontal speed and a vertical speed. The acceleration may indicate achange rate of the UE's speed. The first message may be UE assistanceinformation, a radio resource measurement (RRM) report message, sidelinkUE information, or uplink control information (UCI). Alternatively, thefirst message may be transmitted to the base station aperiodically. Forexample, the UE may be configured to transmit the first message to thebase station in response to a request from the base station.

The base station may be configured to receive the first message from theUE, and identify one or more of the position, the speed, and theacceleration included in the first message. The base station mayconfigure geographic zones for sidelink communication (S710). Differentzone types classified based on toe a UE speed may be configured. Forexample, a high-zone for a UE with a speed equal to or greater than a UEspeed threshold may be configured, and a low-zone for a UE with a speedless than the UE speed threshold may be configured. The base station maybe configured to generate configuration information of the high-zone andthe low-zone. The configuration information (i.e., zone configurationinformation) may be defined as shown in Table 3 below. In other words,the configuration information may include information on the two zonetypes (e.g., high-zone and low-zone).

TABLE 3 Information element Description UE speed threshold The UE usesthe high-zone when the UE speed is equal to or higher than the UE speedthreshold, and uses the low-zone when the UE speed is lower than the UEspeed threshold. High-zone Length The length of each of high-zones WidthThe width of each of high-zones Longitude The total number of high-zonesconfigured in information the longitudinal direction Latitude The totalnumber of high-zones configured in information the latitudinal directionLow-zone Length The length of each of low-zones Width The width of eachof low-zones Longitude The total number of low-zones configured ininformation the longitudinal direction Latitude The total number oflow-zones configured in information the latitudinal direction

The length of the high-zone may be greater than the length of thelow-zone, and the width of the high-zone may be greater than the widthof the low-zone. Thus, the total number of high-zones configured in thelongitudinal direction may be less than the total number of low-zonesconfigured in the longitudinal direction. The total number of high-zonesconfigured in the latitudinal direction may be less than the totalnumber of low-zones configured in the latitudinal direction. The lengthof each of the high-zone and low-zone may be configured in units of 5 m.For example, the length of each of the high-zone and low-zone may beconfigured to be 5 m, 10 m, 15 m, 20 m, 25 m, 30 m, or the like. Thewidth of each of the high-zone and the low-zone may be configured inunits of 5 m. For example, the width of each of the high-zone and thelow-zone may be configured to be 5 m, 10 m, 15 m, 20 m, 25 m, 30 m, orthe like.

Alternatively, the zone types may be classified into high-zone,medium-zone, and low-zone based on the UE speed. In particular, a UEspeed threshold1 and a UE speed threshold2 may be configured. The speedindicated by the UE speed threshold1 may be greater than the speedindicated by the UE speed threshold2. A high-zone for a UE with a speedequal to or greater than the UE speed threshold1 may be configured. Amedium-zone for a UE having a speed less than the UE speed threshold1and equal to or greater than the UE speed threshold2 may be configured.A low-zone for a UE having a speed less than the UE speed threshold2 maybe configured. The configuration information may be defined as shown inTable 4 below. In other words, the configuration information may includeinformation on three zone types (e.g., high-zone, medium-zone, andlow-zone).

TABLE 4 Information element Description UE speed threshold1 The UE usesthe high-zone when the UE speed is equal to or higher than the UE speedthreshold1. UE speed threshold2 The UE uses the medium-zone when the UEspeed is lower than the UE speed threshold1 and equal to or higher thanthe UE speed threshold2. The UE uses the low-zone when the UE speed islower than the UE speed threshold2. High-zone Length The length of eachof high-zones Width The width of each of high-zones Longitude The totalnumber of high-zones configured information in the longitudinaldirection Latitude The total number of high-zones configured ininformation the latitudinaldirection Medium- Length The length of eachof medium-zones zone Width The width of each of medium-zones LongitudeThe total number of medium-zones configured information in thelongitudinal direction Latitude The total number of medium-zonesconfigured information in the latitudinal direction Low-zone Length Thelength of each of low-zones Width The width of each of low-zonesLongitude The total number of low-zones configured information in thelongitudinal direction Latitude The total number of low-zones configuredin information the latitudinal direction

The length of the high-zone may be greater than the length of themedium-zone, and the length of the medium-zone may be greater than thelength of the low-zone. The width of the high-zone may be greater thanthe width of the medium-zone, and the width of the medium-zone may begreater than the width of the low-zone. Thus, the total number ofhigh-zones configured in the longitudinal direction may be less than thetotal number of medium-zones configured in the longitudinal direction,and the total number of medium-zones configured in the longitudinaldirection may be less than the total number of low-zones configured inthe longitudinal direction. The total number of high-zones configured inthe latitudinal direction may be less than the total number ofmedium-zones configured in the latitudinal direction, and the totalnumber of medium-zones configured in the latitudinal direction may beless than the total number of low-zones configured in the latitudinaldirection.

The length of each of the high-zone, the medium zone, and low-zone maybe configured in units of 5 m. For example, the length of each of thehigh-zone, the medium zone, and low-zone may be configured to be 5 m, 10m, 15 m, 20 m, 25 m, 30 m, or the like. The width of each of thehigh-zone, the medium-zone, and the low-zone may be configured in unitsof 5 m. For example, the width of each of the high-zone, themedium-zone, and the low-zone may be configured to be 5 m, 10 m, 15 m,20 m, 25 m, 30 m, or the like.

On the other hand, when the configuration of the zones is completed, thebase station may configure one or more resource pools for each of thezones (S720). The configuration information of the resource pool(referred to as ‘resource pool configuration information’) may bedefined as shown in Table 5 below.

TABLE 5 Information element Description Time information indicate timeresources (e.g., number of slots or subframes, offset, etc.)constituting the resource pool Frequency information indicate frequencyresources (e.g., number of subchannels, a staring resource block (RB) ofthe subchannels, a starting RB of a PSCCH, etc.) constituting theresource pool Zone identifier (ID) Zone ID mapped to the resource pool

The configuration information of the resource pool may further includeinformation elements (e.g., data transmission parameters, a channel busyratio (CBR) threshold, a pool reporting identifier (ID), etc.) otherthan the information elements defined in Table 5. The zone ID may beconfigured differently for each of the zones. The zone ID may bedetermined based on Equation 1 below.

$\begin{matrix}{x_{1} = {{Floor}\left( \frac{x}{L} \right){mod}N_{x}}} & {{Equation}1}\end{matrix}$ $y_{1} = {{Floor}\left( \frac{y}{W} \right){mod}N_{y}}$zoneID = y₁ * N_(x) + x₁

wherein L may be the length as defined in Table 3 or Table 4; W may bethe width as defined in Table 3 or Table 4; N_(x) may be the longitudeinformation defined in Table 3 or Table 4; N_(y) may be the latitudeinformation defined in Table 3 or Table 4; x may be a geographicaldistance between the current position of the UE and a geographicalcoordinate (0, 0) in the longitudinal axis; and y may be a geographicaldistance between the current position of the UE and the geographicalcoordinate (0, 0) in the latitudinal axis. Additionally, x and y may beexpressed in meters. Thus, each of the zones configured by the basestation (e.g., high-zone, medium-zone, low-zone) may have a differentzone ID.

The base station may be configured to transmit a second message thatincludes the configuration information of the zones (i.e., zoneconfiguration information) and the configuration information of theresource pools (i.e., resource pool configuration information) to the UE(S730). The second message may be transmitted via one or more of systeminformation, an RRC message, a MAC control element (CE), and downlinkcontrol information (DCI). For example, the second message may be asystem information block (SIB) 21. The zone configuration informationmay be the configuration information defined in Table 3 or theconfiguration information defined in Table 4.

When the configuration information defined in Table 3 is included in thesecond message, the second message may include configuration informationof one or more resource pools for the high-zones and configurationinformation of one or more resource pools for the low-zones. When theconfiguration information defined in Table 4 is included in the secondmessage, the second message may include configuration information of oneor more resource pools for the high-zones, configuration information ofone or more resource pools for the medium-zones, and configurationinformation of one or more resource pools for the low-zones.

The UE may be configured to receive the second message from the basestation, and identify the zone configuration information and theresource pool configuration information which are included in the secondmessage. The UE may be configured to select one of the zone typesindicated by the second message based on its current speed (S740). Whenthe zone configuration information includes a single UE speed threshold,the UE may be configured to compare a current speed thereof to the UEspeed threshold. When the current speed of the UE is equal to or greaterthan the UE speed threshold, the UE may be configured to select thehigh-zone. When the current speed of the UE is less than the UE speedthreshold, the UE may be configured to select the low-zone.

When the zone configuration information includes two UE speed thresholds(i.e., UE speed threshold1 and UE speed threshold2), the UE may beconfigured to compare a current speed thereof to the UE speed threshold1and the UE speed threshold2. When the current speed of the UE is greaterthan or equal to the UE speed threshold1, the UE may be configured toselect the high-zone. When the current speed of the UE is less than theUE speed threshold1 and equal to or greater than the UE speedthreshold2, the UE may be configured to select the medium-zone. When thecurrent speed of the UE is less than the UE speed threshold2, the UE maybe configured to select the low-zone.

The UE may be configured to determine an ID of the selected zone (S750).For example, the UE may be configured to determine the zone ID usingEquation 1. In particular, the variables L, W, N_(x), and N_(y) inEquation 1 may be obtained from the zone configuration informationincluded in the second message. In Equation 1, x and y may be calculatedbased on the current position of the UE and the geographical coordinate(0, 0). The UE may be configured to transmit a third message includingat least one of the zone type selected at the step S740 and the zone IDdetermined at the step S750 to the base station (S760). The thirdmessage may be a physical uplink shared channel (PUSCH), sidelink UEinformation, or a UCI. The base station may be configured to receive thethird message from the UE and identify the zone type and/or the zone IDdetermined by the UE based on the information included in the thirdmessage. Here, the step S760 may be omitted.

The UE may be configured to select a resource pool mapped to the zone IDdetermined in the step S750 among the resource pools indicated by thesecond message, and perform sidelink communication with another UE usingthe selected resource pool (S770). Since the resource pool configurationinformation includes zone IDs corresponding to resource pools, the UEmay be configured to identify the configuration information includingthe same zone ID as the zone ID determined in the step S750, and performthe sidelink communication using the resource pool corresponding to theconfiguration information.

Sidelink Communication Method Based on the Scheme #2

FIG. 8 is a sequence chart illustrating a second exemplary embodiment ofa sidelink communication method in a communication system. As shown inFIG. 8 , a communication system may include a base station and a UE. Thebase station may be a base station belonging to the cellularcommunication system 140 shown in FIG. 1 , and the UE may be a UElocated in the vehicle 100 shown in FIG. 1 . For example, the basestation may be the base station 210 shown in FIG. 2 , and the UE may beone of the UEs 231 to 236 shown in FIG. 2 . Each of the base station andthe UE may be configured to be the same as or similar to thecommunication node 300 shown in FIG. 3 . The UE may support the protocolstacks shown in FIGS. 4 to 6 .

A UE (e.g., a UE operating in the RRC connected state) may be configuredto periodically transmit a first message to the base station, thatincludes at least one of information regarding a position, a speed, andan acceleration of the UE (S800). The position may indicate a longitudeand a latitude of the UE's current position. For example, the positionmay be a geographical coordinate of the current position of the UE. Thespeed may indicate a current speed of the UE, and may include ahorizontal speed and a vertical speed. The acceleration may indicate achange rate of the UE's speed. The first message may be UE assistanceinformation, an RRM report message, sidelink UE information, or a UCI.Alternatively, the first message may be transmitted to the base stationaperiodically. For example, the UE may be configured to transmit thefirst message to the base station at a request of the base station.

The base station may be configured to receive the first message from theUE, and identify one or more of the position, the speed, and theacceleration included in the first message. The base station mayconfigure zones based on the speed of the UE (S810). When a single UEspeed threshold is used, the base station may be configured to comparethe UE speed indicated by the first message to the UE speed threshold.When the speed of the UE is equal to or greater than the UE speedthreshold, the base station may configure the high-zones. When the speedof the UE is less than the UE speed threshold, the base station mayconfigure the low-zones.

When two UE speed thresholds (i.e., UE speed threshold1 and UE speedthreshold2) are used, the base station may be configured to compare theUE speed indicated by the first message to the UE speed threshold1 andthe UE speed threshold2. When the speed of the UE is equal to or greaterthan the UE speed threshold1, the base station may configure thehigh-zones. When the speed of the UE is less than the UE speedthreshold1 and equal to or greater than the UE speed threshold2, thebase station may configure the medium-zones. When the speed of the UE isless than the UE speed threshold2, the base station may configure thelow-zones.

The length of the high-zone may be greater than the length of themedium-zone, and the length of the medium-zone may be greater than thelength of the low-zone. The length of each of the high-zone, themedium-zone, and the low-zone may be configured in units of 5 ms. Thewidth of the high-zone may be greater than the width of the medium-zone,and the width of the medium-zone may be greater than the width of thelow-zone. The width of each of the high-zone, the medium-zone, and thelow-zone may be configured in units of 5 ms.

Thus, the total number of high-zones configured in the longitudinaldirection may be less than the total number of medium-zones configuredin the longitudinal direction, and the total number of medium-zonesconfigured in the longitudinal direction may be less than the totalnumber of low-zones configured in the longitudinal direction. The totalnumber of high-zones configured in the latitudinal direction may be lessthan the total number of medium-zones configured in the latitudinaldirection, and the total number of medium-zones configured in thelatitudinal direction may be less than the total number of low-zonesconfigured in the latitudinal direction.

The configuration information of the zones (i.e., zone configurationinformation) determined by the base station may be defined as shown inTable 6 below. In other words, the configuration information may includeinformation on the zones configured according to the selected zone type(e.g., high-zone, medium-zone, or low-zone).

TABLE 6 Information element Description Length The length of each ofzones Width The width of each of zones Longitude information The totalnumber of zones configured in the longitudinal direction Latitudeinformation The total number of zones configured in the latitudinaldirection

When the configuration of the zones is completed, the base station mayconfigure a resource pool for each of the zones (S820). Theconfiguration information of the resource pool (i.e., resource poolconfiguration information) may be defined as shown in Table 5. The zoneID may be determined based on Equation 1. The resource poolconfiguration information may further include information elements(e.g., data transmission parameters a CBR threshold, a pool reportingID, etc.) other than the information elements defined in Table 5.

The base station may be configured to transmit a second messageincluding the zone configuration information and the resource poolconfiguration information to the UE (S830). The second message may betransmitted via one or more of system information, an RRC message, a MACCE, and a DCI. For example, the second message may be an RRC connectionreconfiguration message. Alternatively, the second message may be an SIB21. The zone configuration information may be the configurationinformation defined in Table 6, and the resource pool configurationinformation may be the configuration information defined in Table 5.

The UE may be configured to receive the second message from the basestation, and identify the zone configuration information and theresource pool configuration information, included in the second message.The UE may be configured to determine a zone ID based on the zoneconfiguration information (S840). For example, the UE may be configuredto determine the zone ID using Equation 1. In particular, the variablesL, W, N_(x), and N_(y) in Equation 1 may be obtained from the zoneconfiguration information included in the second message. In Equation 1,x and y may be calculated based on the current position of the UE andthe geographical coordinate (0, 0).

The UE may be configured to select a resource pool mapped to the zone IDdetermined in the step S840 among the resource pools indicated by thesecond message, and perform sidelink communication with another UE usingthe selected resource pool (S770). Since the resource pool configurationinformation includes zone IDs corresponding to resource pools, the UEmay be configured to identify the configuration information includingthe same zone ID as the zone ID determined in the step S840, and thesidelink communication using the resource pool corresponding to theconfiguration information.

The exemplary embodiments of the present disclosure may be implementedas program instructions executable by a variety of computers andrecorded on non-transitory a computer readable medium. Thenon-transitory computer readable medium may include a programinstruction, a data file, a data structure, or a combination thereof.The program instructions recorded on the non-transitory computerreadable medium may be designed and configured specifically for thepresent disclosure or may be publicly known and available to those whoare skilled in the field of computer software.

Examples of the non-transitory computer readable medium may include ahardware device such as ROM, RAM, and flash memory, which arespecifically configured to store and execute the program instructions.Examples of the program instructions include machine codes made by, forexample, a compiler, as well as high-level language codes executable bya computer, using an interpreter. The above exemplary hardware devicemay be configured to operate as at least one software module to performthe exemplary embodiments of the present disclosure, and vice versa.

While the exemplary embodiments of the present disclosure and theiradvantages have been described in detail, it should be understood thatvarious changes, substitutions and alterations may be made hereinwithout departing from the scope of the present disclosure.

What is claimed is:
 1. A user equipment (UE), comprising: a processor,wherein the processor causes the UE to: receive a message that includeszone configuration information and resource pool configurationinformation from a base station; select a zone type mapped to a speed ofthe UE among a plurality of zone types indicated by the zoneconfiguration information; determine a zone identifier based onconfiguration information of the selected zone type, the configurationinformation of the selected zone type being included in the zoneconfiguration information; transmit at least one of the selected zonetype or the determined zone identifier to the base station; and performsidelink communication using a resource pool mapped to the determinedzone identifier among resource pool(s) indicated by the resource poolconfiguration information, wherein the plurality of zone types havedifferent zone-sizes, and a zone-size of the selected zone type isdifferent from a zone-size of other zone type except for the selectedzone type among the plurality of zone types.
 2. The UE according toclaim 1, wherein the plurality of zone types are classified into ahigh-zone and a low-zone, the high-zone and the low-zone have differentsizes, the high-zone is selected among the plurality of zone types whenthe speed of the UE is equal to or greater than a speed threshold, andthe low-zone is selected among the plurality of zone types when thespeed of the UE is less than the speed threshold.
 3. The UE according toclaim 2, wherein the zone configuration information includes the speedthreshold.
 4. The UE according to claim 2, wherein the resource poolconfiguration information includes configuration information of resourcepools for the high-zone and configuration information of resource poolsfor the low-zone.
 5. The UE according to claim 1, wherein the pluralityof zone types are classified into a high-zone, a medium-zone, and alow-zone, the high-zone, the medium-zone, and the low-zone havedifferent sizes, the high-zone is selected among the plurality of zonetypes when the speed of the UE is equal to or greater than a first speedthreshold, the medium- zone is selected among the plurality of zonetypes when the speed of the UE is less than the first speed thresholdand equal to or greater than a second speed threshold, the low-zone isselected among the plurality of zone types when the speed of the UE isless than the second speed threshold, and the first speed threshold isgreater than the second speed threshold.
 6. The UE according to claim 1,wherein the message is a system information block (SIB).
 7. The UEaccording to claim 1, wherein the processor further causes the UE to:before receiving the message, transmit information regarding a positionof the UE and the speed of the UE to the base station.
 8. A basestation, comprising: a processor, wherein the processor causes the basestation to: generate zone configuration information includingconfiguration information of a plurality of zone types; generateresource pool configuration information including configurationinformation of resource pools for the plurality of zone types; transmita message including the zone configuration information and the resourcepool configuration information to a user equipment (UE); and receive atleast one of a zone type selected by the UE among the plurality of zonetypes or a zone identifier determined by the UE based on configurationinformation of the zone type from the UE, wherein the plurality of zonetypes have different zone-sizes, and a zone-size of one zone type isdifferent from a zone-size of other zone type except for the one zonetype among the plurality of zone types.
 9. The base station according toclaim 8, wherein the plurality of zone types are classified into ahigh-zone and a low-zone, the high-zone and the low-zone have differentsizes, the high-zone is selected among the plurality of zone types whenthe speed of the UE is equal to or greater than a speed threshold, andthe low-zone is selected among the plurality of zone types when thespeed of the UE is less than the speed threshold.
 10. The base stationaccording to claim 9, wherein the zone configuration informationincludes the speed threshold.
 11. The base station according to claim 9,wherein the resource pool configuration information includesconfiguration information of resource pools for the high-zone andconfiguration information of resource pools for the low-zone.
 12. Thebase station according to claim 8, wherein the plurality of zone typesare classified into a high-zone, a medium-zone, and a low-zone, thehigh-zone, the medium-zone, and the low-zone have different sizes, thehigh-zone is selected among the plurality of zone types when the speedof the UE is equal to or greater than a first speed threshold, themedium-zone is selected among the plurality of zone types when the speedof the UE is less than the first speed threshold and equal to or higherthan a second speed threshold, the low-zone is selected among theplurality of zone types when the speed of the UE is less than the secondspeed threshold, and the first speed threshold is greater than thesecond speed threshold.
 13. A method of a user equipment (UE),comprising: receiving a message that includes zone configurationinformation and resource pool configuration information from a basestation; selecting a zone type mapped to a speed of the UE among aplurality of zone types indicated by the zone configuration information;determining a zone identifier based on configuration information of theselected zone type, the configuration information of the selected zonetype being included in the zone configuration information; transmittingat least one of the selected zone type or the determined zone identifierto the base station; and performing sidelink communication using aresource pool mapped to the determined zone identifier among resourcepool(s) indicated by the resource pool configuration information,wherein the plurality of zone types have different zone-sizes, and azone-size of the selected zone type is different from a zone-size ofother zone type except for the selected zone type among the plurality ofzone types.
 14. The method according to claim 13, wherein the pluralityof zone types are classified into a high-zone and a low-zone, thehigh-zone and the low-zone have different sizes, the high-zone isselected among the plurality of zone types when the speed of the UE isequal to or greater than a speed threshold, and the low-zone is selectedamong the plurality of zone types when the speed of the UE is less thanthe speed threshold.
 15. The method according to claim 14, wherein thezone configuration information includes the speed threshold.
 16. Themethod according to claim 14, wherein the resource pool configurationinformation includes configuration information of resource pools for thehigh-zone and configuration information of resource pools for thelow-zone.
 17. The method according to claim 13, wherein the plurality ofzone types are classified into a high-zone, a medium-zone, and alow-zone, the high-zone, the medium-zone, and the low-zone havedifferent sizes, the high-zone is selected among the plurality of zonetypes when the speed of the UE is equal to or greater than a first speedthreshold, the medium- zone is selected among the plurality of zonetypes when the speed of the UE is less than the first speed thresholdand equal to or greater than a second speed threshold, the low-zone isselected among the plurality of zone types when the speed of the UE isless than the second speed threshold, and the first speed threshold isgreater than the second speed threshold.
 18. The method according toclaim 13, wherein the message is a system information block (SIB). 19.The method according to claim 13, further comprising: before receivingthe message, transmitting information regarding a position of the UE andthe speed of the UE to the base station.